Buffer I/O error on dev loop2, logical block 0, async page read
Buffer I/O error on dev loop2, logical block 0, async page read
Buffer I/O error on dev loop2, logical block 0, async page read
random: crng init done
INFO: task syz-executor1:4081 blocked for more than 120 seconds.
      Not tainted 4.9.89-gf361eb3 #62
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1   D29120  4081   3870 0x00000004
 ffff8801cf2d8000 ffff8801bdd8b480 ffff8801cc2c2f40 ffff8801d71a4800
 ffff8801db321b98 ffff8801cd917aa0 ffffffff838a6c0b 0000000041b58ab3
 ffffffff84194320 00ffffff8123c550 ffff8801db322468 ffff8801db322490
Call Trace:
 [<ffffffff838a81af>] schedule+0x7f/0x1b0 kernel/sched/core.c:3551
 [<ffffffff838b416c>] schedule_timeout+0x56c/0x10b0 kernel/time/timer.c:1768
 [<ffffffff838a63be>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:5173
 [<ffffffff838a9b1e>] do_wait_for_common kernel/sched/completion.c:75 [inline]
 [<ffffffff838a9b1e>] __wait_for_common kernel/sched/completion.c:93 [inline]
 [<ffffffff838a9b1e>] wait_for_common_io kernel/sched/completion.c:107 [inline]
 [<ffffffff838a9b1e>] wait_for_completion_io+0x20e/0x2e0 kernel/sched/completion.c:155
 [<ffffffff81cdc93b>] submit_bio_wait+0x11b/0x180 block/bio.c:885
 [<ffffffff81d0fae7>] blkdev_issue_flush+0x157/0x220 block/blk-flush.c:518
 [<ffffffff8162b1e5>] blkdev_fsync+0x85/0xb0 fs/block_dev.c:378
 [<ffffffff81616b1a>] vfs_fsync_range+0x10a/0x250 fs/sync.c:195
 [<ffffffff81616cd2>] vfs_fsync fs/sync.c:209 [inline]
 [<ffffffff81616cd2>] do_fsync+0x42/0xb0 fs/sync.c:219
 [<ffffffff81617479>] SYSC_fdatasync fs/sync.c:233 [inline]
 [<ffffffff81617479>] SyS_fdatasync+0x19/0x20 fs/sync.c:231
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b7ad3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/516:
 #0:  (rcu_read_lock){......}, at: [<ffffffff81373705>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81373705>] watchdog+0x125/0xa70 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff812386b0>] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4336
2 locks held by getty/3782:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff838b5ce2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff8200b5a4>] n_tty_read+0x1f4/0x16c0 drivers/tty/n_tty.c:2133

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 516 Comm: khungtaskd Not tainted 4.9.89-gf361eb3 #62
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d86cfd00 ffffffff81d96069 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810bb690 ffff8801d86cfd38
 ffffffff81da118d 0000000000000001 0000000000000000 ffff8801cf34e418
Call Trace:
 [<ffffffff81d96069>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d96069>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81da118d>] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99
 [<ffffffff81da12c7>] nmi_trigger_cpumask_backtrace+0x117/0x190 lib/nmi_backtrace.c:60
 [<ffffffff810bb784>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81373cd0>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81373cd0>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81373cd0>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81373cd0>] watchdog+0x6f0/0xa70 kernel/hung_task.c:239
 [<ffffffff8119af4d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838b7c9c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3653 Comm: rsyslogd Not tainted 4.9.89-gf361eb3 #62
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801b58a6000 task.stack: ffff8801b5ba8000
RIP: 0010:[<ffffffff81c0dbbd>] 
c [<ffffffff81c0dbbd>] avtab_search_node+0x11d/0x490 security/selinux/ss/avtab.c:228
RSP: 0018:ffff8801b5baf6b8  EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffff8801ce3b9100 RCX: ffff8801b5baf822
RDX: 0000000000000000 RSI: 0000000000001fff RDI: ffffffff85960518
RBP: ffff8801b5baf708 R08: ffffed0036b75f45 R09: ffff8801b5bafa04
R10: 0000000000000005 R11: ffffed0036b75f44 R12: 000000000000041b
R13: ffff8801b5baf9c0 R14: ffff8801b5baf820 R15: ffff8801b5baf820
FS:  00007f45c2d9a700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc771d67a30 CR3: 00000001bc80c000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801b5baf822
c 0000000000000ba5
c 00000000000000ab
c ffff8801b5baf820
c
 ffff88010707d300
c ffffffff85960508
c 00000000000000aa
c ffff8801b5baf9c0
c
 dffffc0000000000
c ffff8801b5baf820
c ffff8801b5baf760
c ffffffff81c349dc
c
Call Trace:
 [<ffffffff81c349dc>] cond_compute_av+0x5c/0x2e0 security/selinux/ss/conditional.c:646
 [<ffffffff81c27f00>] context_struct_compute_av+0x9d0/0x10b0 security/selinux/ss/services.c:681
 [<ffffffff81c2a662>] security_compute_av+0x2f2/0x7d0 security/selinux/ss/services.c:1120
 [<ffffffff81bda70b>] avc_compute_av+0xcb/0x640 security/selinux/avc.c:976
 [<ffffffff81bdc8e8>] avc_has_perm_noaudit security/selinux/avc.c:1114 [inline]
 [<ffffffff81bdc8e8>] avc_has_perm+0x378/0x4f0 security/selinux/avc.c:1148
 [<ffffffff81bf5219>] task_has_system+0x159/0x240 security/selinux/hooks.c:1697
 [<ffffffff81bf5530>] selinux_syslog+0x80/0x90 security/selinux/hooks.c:2252
 [<ffffffff81bd168d>] security_syslog+0x6d/0xa0 security/security.c:210
 [<ffffffff81264ae9>] check_syslog_permissions+0x59/0x100 kernel/printk/printk.c:635
 [<ffffffff81267ea9>] do_syslog+0x89/0xb10 kernel/printk/printk.c:1435
 [<ffffffff816ec494>] kmsg_read+0x74/0xa0 fs/proc/kmsg.c:39
 [<ffffffff816c308f>] proc_reg_read+0xef/0x170 fs/proc/inode.c:202
 [<ffffffff8156c933>] __vfs_read+0x103/0x670 fs/read_write.c:449
 [<ffffffff8157084e>] vfs_read+0x11e/0x380 fs/read_write.c:472
 [<ffffffff81574549>] SYSC_read fs/read_write.c:588 [inline]
 [<ffffffff81574549>] SyS_read+0xd9/0x1b0 fs/read_write.c:581
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b7ad3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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